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Real‐time monitoring of Escherichia coli concentration with planar microwave resonator sensor
Author(s) -
Mohammadi Sevda,
Narang Rakesh,
Mohammadi Ashani Mehdi,
Sadabadi Hamid,
SanatiNezhad Amir,
Zarifi Mohammad H.
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31913
Subject(s) - resonator , microwave , hfss , sensitivity (control systems) , planar , substrate (aquarium) , materials science , optoelectronics , electronic engineering , electrical engineering , analytical chemistry (journal) , engineering , chemistry , telecommunications , computer science , chromatography , oceanography , computer graphics (images) , microstrip antenna , antenna (radio) , geology
This work presents a microfluidic chip integrated with a microwave resonator sensor for real‐time and contactless detection of Escherichia coli bacteria concentration. The design is fabricated on a Rogers RT/duroid 5880 high‐frequency substrate and operates at 2.5 ∼ 2.6 GHz, in the ISM band, with an initial quality factor of 112. The presented sensor demonstrates resonant amplitude sensitivity of −0.01231 dB/log(OD 600 ) and resonant frequency sensitivity of −56 kHz/log(OD 600 ) for E. coli concentration in a constant pH of 7.5. To facilitate the analysis of the proposed structure, a lumped equivalent circuit is presented and simulated in ADS and proven accurate by both HFSS microwave simulations and experimental results.